<?php
class Report01Filter extends AbsReportFilter {
    
    /**
     * (non-PHPdoc)
     * @see modules/report/local/includes/AbsReportFilter#renderExtraFilter()
     */
    public function renderExtraFilter() {
        $result = '';
        $currentControllerPath = $this->controller->view->path;
        $this->controller->view->path = 'report1';    
        
        /**
         * Extra report filter comes here 
         */
        
        //$result .= ...    
                
        $this->controller->view->path = $currentControllerPath;                
        return $result;   
    }
}